Error on yarn start

[kharmony]

I used "yarn add react-comments-section" (as we are using yarn) and it worked without errors. However I did receive the following warnings:

warning "react-comments-section > html-to-draftjs@1.5.0" has unmet peer dependency "immutable@3.x.x || 4.x.x".
warning "react-comments-section > react-draft-wysiwyg@1.15.0" has unmet peer dependency "immutable@3.x.x || 4.x.x".
warning "react-comments-section > react-draft-wysiwyg > draftjs-utils@0.10.2" has unmet peer dependency "immutable@3.x.x || 4.x.x".

I did "yarn add immutable@4.3.7" and the warnings disappeared. However, when I do yarn start I get the following error. Does anyone know how to resolve this? Thank you in advance.